The subcontext I got out of what Frank said was that the movie played the characters too safely and made them slaves to continuity, all the while imitating prior projects. And to some extent he's right about that... but that's the way the movie needed to be. If they did something way too daring, they would have lost the crowd that hasn't been with the Muppets for some time. I wonder too if part of that was to blame for hearing they were considering the Cheapest movie, and going with The Muppets instead...
Now, Cheapest may be a great concept, but you have to wonder how you can pull off one joke for 90 minutes and not have it completely fall apart and get stale. Seems like there's a reason why the film was abandoned. Daring, but a gamble that could fall through just as much as it could have succeeded. Plus, let's face it. Without the fresh outsider perspective (as fan ficy you could call the film), we would have had VMX style pop culture jokes (funny, but easily too dated and WAAAAAY too overdosed), and I'm sure Disney would have forced more tween star cameos in the film than what we had. Having a film star on board kinda gave the project some creative freedom that most directors can't get unless they're big names. All and all, the movie was the movie we needed to reboot the franchise, tell people the characters are still relevant, and give the fans some MUCH needed fanservice (the G rated kind)... especially since some of the last projects, the fans were the last thing that were thought of. We know which telefilm I'm referring to, and I needn't mention it again.